#!/bin/bash
#
# chkconfig: 2345 10 90
# description:  network reconfigure
#                                                     
# -------------------------------------------------------------------------- #
# Copyright 2002-2016, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

# Gets IP address from a given MAC
mac2ip() {
    mac=$1
 
    let ip_a=0x`echo $mac | cut -d: -f 3`
    let ip_b=0x`echo $mac | cut -d: -f 4`
    let ip_c=0x`echo $mac | cut -d: -f 5`
    let ip_d=0x`echo $mac | cut -d: -f 6`
 
    ip="$ip_a.$ip_b.$ip_c.$ip_d"
 
    echo $ip
}
 
# Gets the network part of an IP
get_network() {
    IP=$1
 
    echo $IP | cut -d'.' -f1-3
}
 
get_interfaces() {
    IFCMD="/sbin/ifconfig -a"
 
    $IFCMD | grep ^eth | sed 's/ *Link encap:Ethernet.*HWaddr /-/g'
}
 
get_dev() {
    echo $1 | cut -d'-' -f 1
}
 
get_mac() {
    echo $1 | cut -d'-' -f 2
}
 
gen_hosts() {
    NETWORK=$1
    echo "127.0.0.1 localhost"
    for n in `seq -w 01 99`; do
        n2=`echo $n | sed 's/^0*//'`
        echo ${NETWORK}.$n2 cluster${n}
    done
}
 
gen_exports() {
    NETWORK=$1
    echo "/images ${NETWORK}.0/255.255.255.0(rw,async,no_subtree_check)"
}
 
gen_hostname() {
    MAC=$1
    NUM=`mac2ip $MAC | cut -d'.' -f4`
    NUM2=`echo 000000$NUM | sed 's/.*\(..\)/\1/'`
    echo cluster$NUM2
}
 
gen_interface() {
	DEV_MAC=$1
	DEV=`get_dev $DEV_MAC`
	MAC=`get_mac $DEV_MAC`
	IP=`mac2ip $MAC`
	NETWORK=`get_network $IP`
 
cat <<EOT
	ENABLE=yes
	NAME=Ethernet
	IPADDRESS=$IP
	CIDRLEN=24
	NETWORK=$NETWORK.0
	NETMASK=255.255.255.0
	BROADCAST=$NETWORK.255
	DHCP=no
EOT
	if [ $DEV == "eth0" ]; then
		echo "	GATEWAY=$NETWORK.1"
	fi
 
echo ""
}
 
 
IFACES=`get_interfaces`
 
for i in $IFACES; do
  DEV=`get_dev $i`
	gen_interface $i > /etc/sysconfig/network-scripts/ifcfg-${DEV}
done

# gen_hosts $NETWORK > /etc/hosts
 
# gen_exports $NETWORK  > /etc/exports
 
# gen_hostname $MAC  > /etc/hostname

#ifdown $DEV
#ifup $DEV

# /bin/hostname `cat /etc/hostname`
